Thorns are woody

Thorns are woody -...

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Thorns  are woody, sharply pointed branch stems (e.g. honey locust).  Spines  are small, unbranched, sharp outgrowths of leaf tissue in which the  parenchyma is replaced by sclerenchyma (e.g. cactus).  Prickles  are small pointed outgrowths from the epidermis or cortex of the stem (e.g.  rose and raspberry).  Cladophylls  are flattened main stems that resemble leaves (e.g. butcher's-broom,  greenbrier, and some orchids). Edible asparagus shoots left to grow produce many small  fern-like cladophylls.  Stipules  are paired scales, glands, or leaf-like structures at the base of the petiole  formed from leaf or stem tissue (e.g. black locust).  Bracts  are modified leaves at the base of flowers or flower stalks. Some are highly-
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This note was uploaded on 11/14/2011 for the course BIO 1421 taught by Professor Farr during the Fall '08 term at Texas State.

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